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Pension and Other Postretirement Benefits - Amounts Related to Other Postretirement Benefit Plans Recognized in Accumulated Other Comprehensive (Loss) Income (Details) - Other postretirement benefit plans [Member] - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]    
Unrecognized Net Actuarial Losses $ 4,662 $ 5,266
Unrecognized Net Prior Service Credits (1,041) (128)
Total $ 3,621 $ 5,138